0000... When driving on a race track
Attention!
The customer must be informed that in particular the standard brake pads, the wear indicator and the flat tire monitor are not designed for use on race tracks. The vehicle is also not designed to be used in motorsport competitions.
Excessive load on the vehicle, for example through use on a race track or in a motorsport competition, is not covered by the warranty.
If the customer still wants to drive on a race track, the following aspects shall be considered/checked:
The vehicle, particularly the engine and drivetrain, must be carefully broken in before operation on a racetrack. A break-in period of at least 2000 km.
In the case of M vehicles, the break-in service absolutely must have been performed after 2000 km.
In case of AG vehicles, an oil change is recommended after the running-in period.
The duration of the highly dynamic drives on a race track must be increased slowly because the rear axle differential must still be broken in during a high-load operation. This increases the temperature during this time.
The temperature limits in the rear axle differential and in the steering gear could be exceeded during this phase due to extreme loads and very high outside temperatures. This is indicated by a Check Control message. To protect the components, the electrohydraulic lock is deactivated in the rear axle differential. In the steering gear, the steering support is withdrawn gradually, which makes the steering feel less smooth.
After a cooling phase, the two systems recalibrate and function as usual again.
This is not a component defect in either case. There is no need to visit a workshop.
To drive on a race track, the following scope must be observed and carried out on the vehicle.
Model:
Vehicle identification number.................................................................
| Scope of checks before driving on the race track: | ||
|---|---|---|
| Vehicle check | OK. | Comment |
| Perform a comprehensive vehicle check service. | ||
| → SCOPE OF THE VEHICLE CHECK SERVICE | ||
| Engine | OK. | Comment |
| Recommendation: Carry out an engine oil change. | ||
| Transfer box (concerns only those vehicles with rear axle differential with HOC) | OK. | Comment |
| Perform transfer box oil change. | ||
| Cooling System | OK. | Comment |
| Visual inspection of the radiator for contamination. → Draw off contamination. |
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| Brake system | OK. | Comment |
| Check the age of the brake fluid - see Service Manual/Service history. → The age of the brake fluid should not exceed 1 year. |
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| Check the fill level in the brake fluid expansion tank. → If necessary, top up to the maximum level. |
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| Check the brake pad thickness on the front axle. → Wear material thickness ≥ 9 mm → Ideally, install new brake pads. Recommendation for M vehicles: Use sport brake pads if available for the model. |
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| Check the brake pad thickness on the rear axle. → Wear material thickness ≥ rear axle ≥ 8 mm → Ideally, install new brake pads. Recommendation for M vehicles: Use sport brake pads if available for the model. |
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| Check the brake disc thickness on the front axle. → Minimum brake disc thickness: ≥ Minimum brake disc thickness + 1 mm → Ideally, install new brake discs. |
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| Check the brake disc thickness on the rear axle. → Minimum brake disc thickness: ≥ Minimum brake disc thickness + 1 mm → Ideally, install new brake discs. |
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| Visual inspection of the brake line and brake hose for tightness, damage and porosity. | ||
If installed, remove the covers of the brake ventilation ducts in the front section of the front wheel arch covers and keep them in a safe place.
NOTE:
In order to improve the cooling of the brake system, the covers of the brake ventilation ducts must be removed before driving on the race track. The covers of the brake ventilation ducts must be reinstalled before driving on public streets. |
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| Wheels/tires | OK. | Comment |
| Check the suitability of the wheels/tires to be driven on race tracks → Winter tires, all-season tires and tires on steel rims are absolutely unsuitable. Recommendation: Use Sport tires. |
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| Check the tire pressure of all the tires and adjust, if required. → To increase the service life and the tire performance, it is advisable to reduce the tire pressure on the race track; proceed as follows to do this:
NOTE:
The tire pressure can be displayed only up to a system operating temperature of 120°C. At higher temperatures, which can certainly occur during racing, the display is suppressed and a Check Control message is shown. After cooling down, the system functions again without limitations. Background: The tire pressure increases due to the increase in temperature inside the tire while racing. This reduces the contact surface of the tire to the ground and the temperature load on the tire tread increases. Adjusting the tire pressure on warmed-up tires causes a reduction in the pressure compared to the cold conditions and thus leads to a more balanced tire load due to the larger tire contact area. |
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| Extensions when driving on a race track: | ||
|---|---|---|
| Warm up | OK. | Comment |
| Drive a warming up lap. > Bring the engine up to operating temperature. Fast driving at a medium RPM level and medium dynamics. |
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| Cool down | OK. | Comment |
| Drive a cooling down lap. → Fast driving at a medium RPM level and medium dynamics. Avoid brake load as far as possible. |
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| Scope of checks after driving on the race track: | ||
|---|---|---|
| Engine | OK. | Comment |
| Perform an oil-level check according to the operating instructions. → If necessary, top up to the maximum oil level. |
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| Front axle transmission (applies only to G15 with N63 engine) | OK. | Comment |
| Perform an oil change on the front axle transmission. | ||
| Transfer box (concerns only M vehicles) | OK. | Comment |
| Perform transfer box oil change. | ||
| Rear axle differential | OK. | Comment |
| If a rear axle differential with lock is installed. → Perform oil change. |
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| Cooling System | OK. | Comment |
| Visual inspection of the radiator for contamination. → Draw off contamination. |
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| Brake system | OK. | Comment |
| Check the fill level in the brake fluid expansion tank. → If necessary, top up to the maximum level. |
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| Check the brake pad thickness on the front axle. → Replace brake pads when the remaining brake pad thickness is undershot (min. thickness 3.7 mm) |
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| Check the dust boots on the brake calipers of the front axle for damage. | ||
| Check the brake pad thickness on the rear axle. → Replace brake pads when the remaining brake pad thickness is undershot (min. thickness 3.7 mm) |
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| Check the dust boots on the brake calipers of the rear axle for damage. | ||
| Check the brake disc thickness and their state on the front axle. → Replace brake discs when:
|
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| Check the brake disc thickness and their state on the rear axle. → Replace brake discs when:
|
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If installed, reinstall the covers of the brake ventilation ducts in the front part of the front wheel arch covers.
NOTE:
Before driving on public streets, the covers of the brake ventilation ducts must be reinstalled.
|
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| Wheels/tires Note to customer: Carry out the following points on wheels/tires immediately after driving on race tracks and before driving on public streets! |
OK. | Comment |
| Check wheels/tires for damage. | ||
| Check wheels/tires for minimum tread depth. | ||
Check the tire pressure of all the tires and adjust, if required.
Background: Adjustment of the tire pressure when the tire is cold, otherwise TPM warnings could occur due to an excessively low pressure. |
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| Vehicle check | OK. | Comment |
| Perform a comprehensive vehicle check service. → SCOPE OF THE VEHICLE CHECK SERVICE |
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Date
Mechanic
Workshop Supervisor